<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Lit\Utils;

use Psr\Log\AbstractLogger;
use Psr\Log\InvalidArgumentException;
use Psr\Log\LogLevel;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * PSR-3 compliant console logger.
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 *
 * @see https://www.php-fig.org/psr/psr-3/
 */
class ConsoleLogger extends AbstractLogger
{
   const INFO = 'info';
   const ERROR = 'error';

   private $output;
   private $verbosityLevelMap = [
      LogLevel::EMERGENCY => OutputInterface::VERBOSITY_NORMAL,
      LogLevel::ALERT => OutputInterface::VERBOSITY_NORMAL,
      LogLevel::CRITICAL => OutputInterface::VERBOSITY_NORMAL,
      LogLevel::ERROR => OutputInterface::VERBOSITY_NORMAL,
      LogLevel::WARNING => OutputInterface::VERBOSITY_NORMAL,
      LogLevel::NOTICE => OutputInterface::VERBOSITY_VERBOSE,
      LogLevel::INFO => OutputInterface::VERBOSITY_VERY_VERBOSE,
      LogLevel::DEBUG => OutputInterface::VERBOSITY_DEBUG,
   ];
   private $formatLevelMap = [
      LogLevel::EMERGENCY => self::ERROR,
      LogLevel::ALERT => self::ERROR,
      LogLevel::CRITICAL => self::ERROR,
      LogLevel::ERROR => self::ERROR,
      LogLevel::WARNING => self::INFO,
      LogLevel::NOTICE => self::INFO,
      LogLevel::INFO => self::INFO,
      LogLevel::DEBUG => self::INFO,
   ];
   private $errored = false;

   public function __construct(OutputInterface $output, array $verbosityLevelMap = [], array $formatLevelMap = [])
   {
      $this->output = $output;
      $this->verbosityLevelMap = $verbosityLevelMap + $this->verbosityLevelMap;
      $this->formatLevelMap = $formatLevelMap + $this->formatLevelMap;
   }

   /**
    * {@inheritdoc}
    */
   public function log($level, $message, array $context = [])
   {
      if (!isset($this->verbosityLevelMap[$level])) {
         throw new InvalidArgumentException(sprintf('The log level "%s" does not exist.', $level));
      }

      $output = $this->output;

      // Write to the error output if necessary and available
      if (self::ERROR === $this->formatLevelMap[$level]) {
         if ($this->output instanceof ConsoleOutputInterface) {
            $output = $output->getErrorOutput();
         }
         $this->errored = true;
      }

      // the if condition check isn't necessary -- it's the same one that $output will do internally anyway.
      // We only do it for efficiency here as the message formatting is relatively expensive.
      if ($output->getVerbosity() >= $this->verbosityLevelMap[$level]) {
         $output->writeln(sprintf('%3$s</%1$s>', $this->formatLevelMap[$level], $level, $this->interpolate($message, $context)), $this->verbosityLevelMap[$level]);
      }
   }

   /**
    * Returns true when any messages have been logged at error levels.
    *
    * @return bool
    */
   public function hasErrored()
   {
      return $this->errored;
   }

   /**
    * Interpolates context values into the message placeholders.
    *
    * @author PHP Framework Interoperability Group
    */
   private function interpolate(string $message, array $context): string
   {
      if (false === strpos($message, '{')) {
         return $message;
      }

      $replacements = [];
      foreach ($context as $key => $val) {
         if (null === $val || is_scalar($val) || (\is_object($val) && method_exists($val, '__toString'))) {
            $replacements["{{$key}}"] = $val;
         } elseif ($val instanceof \DateTimeInterface) {
            $replacements["{{$key}}"] = $val->format(\DateTime::RFC3339);
         } elseif (\is_object($val)) {
            $replacements["{{$key}}"] = '[object '.\get_class($val).']';
         } else {
            $replacements["{{$key}}"] = '['.\gettype($val).']';
         }
      }

      return strtr($message, $replacements);
   }
}
